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Reinsurance - Additional Information (Details) - USD ($)
Jul. 01, 2024
Jun. 30, 2024
Jul. 01, 2023
Effects of Reinsurance [Line Items]      
Reinsurance, excess retention, amount     $ 10,000,000
Reinsurance, per risk limit, amount     $ 750,000
Cession rate percentage     35.00%
Reinsurance Contract [Axis]: Automatic Facultative Property Per Risk Excess of Loss | Lemonade Insurance Company      
Effects of Reinsurance [Line Items]      
Reinsurance, excess retention, amount reinsured, per policy   $ 3,000,000  
Reinsurance Contract [Axis]: Automatic Facultative Property Per Risk Excess of Loss Reinsurance | Lemonade Insurance Company      
Effects of Reinsurance [Line Items]      
Reinsurance, excess retention, amount reinsured, per policy   $ 10,000,000  
Reinsurance, excess retention, percentage   100.00%  
Reinsurance Contract [Axis]: Excess of Loss Reinsurance Contract      
Effects of Reinsurance [Line Items]      
Reinsurance, excess retention, amount     $ 80,000,000
Reinsurance, amount retained, per event     50,000,000,000,000
Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance      
Effects of Reinsurance [Line Items]      
Reinsurance, excess retention, amount reinsured, per policy     $ 2,250,000
Reinsurance, excess retention, percentage     100.00%
Reinsurance Contract [Axis]: Property Per Risk Excess of Loss Reinsurance | Maximum      
Effects of Reinsurance [Line Items]      
Reinsurance, excess retention, amount reinsured, per policy     $ 750,000
Reinsurance Contract [Axis]: Proportional Reinsurance Contracts      
Effects of Reinsurance [Line Items]      
Percent of contracts subject to participation through reinsurance     20.00%
Reinsurance Contract [Axis]: Reinsurance Program      
Effects of Reinsurance [Line Items]      
Percent of contracts subject to participation through reinsurance 55.00%